The calculated distance (air line) between Hirschberg an der Bergstraße and Dortmund is approximately 148 miles respectively 239 kilometers.
By car or train, the actual journey to Dortmund is certainly longer, as only the direct route (as the crow flies) between Hirschberg an der Bergstraße and Dortmund has been calculated here.
Air line (approximately)
239 kilometers
129 nautical miles